Datasheet

20-Bit Latches
CY74FCT16841T
CY74FCT162841T
SCCS067A - July 1994 - Revised October 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright © 2001, Texas Instruments Incorporated
Features
• FCT-C speed at 5.5 ns (FCT16841T Com’l)
•I
off
supports partial-power-down mode operation
• Edge-rate control circuitry for significantly improved
noise characteristics
• Typical output skew < 250 ps
• ESD > 2000V
• TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
• Industrial temperature range of −40˚C to +85˚C
•V
CC
= 5V ± 10%
CY74FCT16841T Features:
• 64 mA sink current, 32 mA source current
• Typical V
OLP
(ground bounce) <1.0V at V
CC
= 5V,
T
A
= 25˚C
CY74FCT162841T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical V
OLP
(ground bounce) <0.6V at V
CC
= 5V,
T
A
= 25˚C
Functional Description
The CY74FCT16841T and CY74FCT162841T are 20-bit
D-type latches designed for use in bus applications requiring
high speed and low power. These devices can be used as two
independent 10-bit latches, or as a single 10-bit latch, or as a
single 20-bit latch by connecting the Output Enable (
OE) and
Latch (LE) inputs. Flow-through pinout and small shrink
packaging aid in simplifying board layout.
This device is fully specified for partial-power-down
applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
The CY74FCT16841T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162841T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162841T is ideal for driving transmission lines.
C
GND
1
D
1
Pin Configuration
TO 9 OTHER CHANNELS
C
2
D
1
2
Q
1
2
LE
2
OE
D
1
Q
7
1
OE
SSOP/TSSOP
Top View
1
Q
1
1
LE
1
OE
1
Q
1
1
Q
2
1
Q
3
1
Q
4
1
D
1
1
D
2
1
D
3
1
D
4
1
LE
GND
GND
V
CC
1
Q
5
1
Q
6
1
D
5
1
D
6
V
CC
GND
2
D
1
GND
GND
V
CC
V
CC
GND
D
1
Q
8
1
Q
10
2
Q
1
1
Q
9
2
Q
2
2
Q
3
2
Q
4
2
Q
5
2
Q
6
2
Q
7
2
Q
8
2
Q
9
2
Q
10
2
OE
1
D
7
GND
1
D
8
1
D
9
1
D
10
2
D
2
2
D
3
2
D
4
2
D
5
2
D
6
2
D
7
2
D
8
2
D
9
2
D
10
2
LE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
FCT16841-1
FCT16841-2
FCT16841-3
TO 9 OTHER CHANNELS
Logic Block Diagrams